When you have low budget, you don't have any business with many coins. Just buy one coin and leave your faith to that coin and if it grow well with profit
That's not a good strategy. You always diversify your investment funds, no matter the amount of them. It's better, in any term, to put in 10 different assets $10 in each asset, rather $100 to just one.
Low ludget also means that you are going to have low risk as well and when you invest huge amount of money into crypto, you will lose more and because altcoins are very volatile, the risk of losing more will likely happen that's why it's good to invest something moderate so you can do a proper risk management until you are conversant with the market to invest large amount of money.
It's true that you can have better chances to succeed if you invest in well established coins and trade with them but it's also true that the lower you enter in a "coin train", the biggest the profit when (and if) goes to the moon. So once again, diversifying your assets will give you the opportunity to make them both. Like 10-20% trading high risk assets and the rest for medium risk trading assets.